Step stool



FIG. 1 is a perspective view of a step stool in accordance with my design, with tray accessory holders, which do not form part of my new design, illustrated in broken lines for illustrative purposes only in FIGS. 1–5;

FIG. 2 is a front elevation view of thereof;

FIG. 3 is a right-side elevation view of thereof;

FIG. 4 is a top plan view of thereof; and,

FIG. 5 is a rear elevation view thereof. 

The ornamental design for a step stool, as shown and described. 